There are several email marketing platforms available, each offering a range of features and pricing options to meet the needs of different businesses and organizations. When choosing an email marketing platform, consider factors such as your budget, the size of your email list, the complexity of your campaigns, and the specific features you require. Here are some popular email marketing platforms as of my last knowledge update in September 2021:

1. **Mailchimp:** Mailchimp is known for its user-friendly interface and offers a variety of templates, automation options, and analytics. It's suitable for both beginners and experienced marketers.

2. **Constant Contact:** Constant Contact provides easy-to-use email marketing tools, including customizable templates, list management, and event marketing features. It's often favored by small businesses and nonprofits.

3. **AWeber:** AWeber offers email marketing and automation tools, along with split testing and analytics. It's a good email marketing platform choice for small to medium-sized businesses.

4. **GetResponse:** GetResponse provides a comprehensive suite of marketing tools, including email marketing, automation, landing pages, and webinars. It's suitable for businesses looking for an all-in-one marketing platform.

5. **HubSpot:** HubSpot's marketing automation platform includes email marketing capabilities, along with CRM integration, lead nurturing, and inbound marketing tools. It's ideal for businesses focusing on inbound marketing strategies.

6. **ActiveCampaign:** ActiveCampaign is known for its advanced automation and CRM features. It's a powerful platform for businesses looking to create highly personalized and automated email campaigns.

7. **Campaign Monitor:** Campaign Monitor offers customizable email templates, automation workflows, and analytics. It's often chosen by agencies and larger businesses.

8. **SendinBlue:** SendinBlue is known for its affordability and offers email marketing, SMS marketing, and marketing automation. It's suitable for businesses looking for cost-effective options.

9. **ConvertKit:** ConvertKit is designed for bloggers, content creators, and online businesses. It focuses on simplifying email marketing automation and segmentation.

10. **Drip:** Drip is an eCommerce-focused email marketing platform with advanced automation capabilities. It's designed to help online retailers create personalized customer journeys.

11. **MailerLite:** MailerLite is known for its simplicity and affordability. It provides email marketing and automation tools, making it suitable for small businesses and startups.

12. **Benchmark Email:** Benchmark Email offers email marketing and automation features, including responsive templates and list management. It's a user-friendly option for businesses of all sizes.

It's essential to research each platform's current offerings, pricing, and customer reviews to determine which one best aligns with your specific email marketing needs and goals. Many of these platforms also offer free trials or free plans with limited features, allowing you to test them before making a decision.